Although baffles in tanks make sense, they wouldn't work very well in waste tanks, and I've never heard of baffles in a landlocked RV tank - even the freshwater. It might be done, but I wouldn't expect it.
I just find that advice totally impractical, it doesn't relate to real life at all. There might be some cases where I might drain off some water if I was heading for a high pass because my truck isn't exactly over powered but to drain the water to empty because I didn't want the water to shift, never.
Ron
If it's impractical maybe ETI can explain to you why they put it in the manual. What is said in the manual pertains to avoiding side-to-side sloshing. We find the tow to be noticeably lighter and prefer the handling without the extra 250 pounds over the rear axle when traveling any significant distance. Instead we leave just enough so the pump won't suck air and keep a 6 gal jug in the TV and a 3 gal jug at the rear of the bed.
I regularity tow with the tank about 1/4 full when headed to a campsite. Never had a problem.
Most of the time heading camping, I have a full tank and just tow back what I don't use to be topped up later.
For me, the fresh water tank level is not a concern.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
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If you live on the west coast of North America, or any other earthquake zone, you might want to keep your water tanks full and drain and replace periodically. Water will be handy in the event of an 8.9
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